q^2-4q-15=81

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Solution for q^2-4q-15=81 equation:


Simplifying
q2 + -4q + -15 = 81

Reorder the terms:
-15 + -4q + q2 = 81

Solving
-15 + -4q + q2 = 81

Solving for variable 'q'.

Reorder the terms:
-15 + -81 + -4q + q2 = 81 + -81

Combine like terms: -15 + -81 = -96
-96 + -4q + q2 = 81 + -81

Combine like terms: 81 + -81 = 0
-96 + -4q + q2 = 0

Factor a trinomial.
(-8 + -1q)(12 + -1q) = 0

Subproblem 1

Set the factor '(-8 + -1q)' equal to zero and attempt to solve: Simplifying -8 + -1q = 0 Solving -8 + -1q = 0 Move all terms containing q to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -1q = 0 + 8 Combine like terms: -8 + 8 = 0 0 + -1q = 0 + 8 -1q = 0 + 8 Combine like terms: 0 + 8 = 8 -1q = 8 Divide each side by '-1'. q = -8 Simplifying q = -8

Subproblem 2

Set the factor '(12 + -1q)' equal to zero and attempt to solve: Simplifying 12 + -1q = 0 Solving 12 + -1q = 0 Move all terms containing q to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -1q = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -1q = 0 + -12 -1q = 0 + -12 Combine like terms: 0 + -12 = -12 -1q = -12 Divide each side by '-1'. q = 12 Simplifying q = 12

Solution

q = {-8, 12}

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